1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Freescale vf610 GPIO support through PORT and GPIO 4 * 5 * Copyright (c) 2014 Toradex AG. 6 * 7 * Author: Stefan Agner <stefan@agner.ch>. 8 */ 9 #include <linux/bitops.h> 10 #include <linux/clk.h> 11 #include <linux/err.h> 12 #include <linux/gpio/driver.h> 13 #include <linux/gpio/generic.h> 14 #include <linux/init.h> 15 #include <linux/interrupt.h> 16 #include <linux/io.h> 17 #include <linux/ioport.h> 18 #include <linux/irq.h> 19 #include <linux/pinctrl/consumer.h> 20 #include <linux/platform_device.h> 21 #include <linux/property.h> 22 23 #define VF610_GPIO_PER_PORT 32 24 25 struct fsl_gpio_soc_data { 26 /* SoCs has a Port Data Direction Register (PDDR) */ 27 bool have_paddr; 28 bool have_dual_base; 29 }; 30 31 struct vf610_gpio_port { 32 struct gpio_generic_chip chip; 33 void __iomem *base; 34 void __iomem *gpio_base; 35 const struct fsl_gpio_soc_data *sdata; 36 u8 irqc[VF610_GPIO_PER_PORT]; 37 struct clk *clk_port; 38 struct clk *clk_gpio; 39 int irq; 40 }; 41 42 #define GPIO_PDOR 0x00 43 #define GPIO_PSOR 0x04 44 #define GPIO_PCOR 0x08 45 #define GPIO_PTOR 0x0c 46 #define GPIO_PDIR 0x10 47 #define GPIO_PDDR 0x14 48 49 #define PORT_PCR(n) ((n) * 0x4) 50 #define PORT_PCR_IRQC_OFFSET 16 51 52 #define PORT_ISFR 0xa0 53 #define PORT_DFER 0xc0 54 #define PORT_DFCR 0xc4 55 #define PORT_DFWR 0xc8 56 57 #define PORT_INT_OFF 0x0 58 #define PORT_INT_LOGIC_ZERO 0x8 59 #define PORT_INT_RISING_EDGE 0x9 60 #define PORT_INT_FALLING_EDGE 0xa 61 #define PORT_INT_EITHER_EDGE 0xb 62 #define PORT_INT_LOGIC_ONE 0xc 63 64 #define IMX8ULP_GPIO_BASE_OFF 0x40 65 #define IMX8ULP_BASE_OFF 0x80 66 67 static const struct fsl_gpio_soc_data vf610_data = { 68 .have_dual_base = true, 69 }; 70 71 static const struct fsl_gpio_soc_data imx_data = { 72 .have_paddr = true, 73 .have_dual_base = true, 74 }; 75 76 static const struct fsl_gpio_soc_data imx8ulp_data = { 77 .have_paddr = true, 78 }; 79 80 static const struct of_device_id vf610_gpio_dt_ids[] = { 81 { .compatible = "fsl,vf610-gpio", .data = &vf610_data }, 82 { .compatible = "fsl,imx7ulp-gpio", .data = &imx_data, }, 83 { .compatible = "fsl,imx8ulp-gpio", .data = &imx8ulp_data, }, 84 { /* sentinel */ } 85 }; 86 87 static inline void vf610_gpio_writel(u32 val, void __iomem *reg) 88 { 89 writel_relaxed(val, reg); 90 } 91 92 static inline u32 vf610_gpio_readl(void __iomem *reg) 93 { 94 return readl_relaxed(reg); 95 } 96 97 static void vf610_gpio_irq_handler(struct irq_desc *desc) 98 { 99 struct vf610_gpio_port *port = 100 gpiochip_get_data(irq_desc_get_handler_data(desc)); 101 struct irq_chip *chip = irq_desc_get_chip(desc); 102 int pin; 103 unsigned long irq_isfr; 104 105 chained_irq_enter(chip, desc); 106 107 irq_isfr = vf610_gpio_readl(port->base + PORT_ISFR); 108 109 for_each_set_bit(pin, &irq_isfr, VF610_GPIO_PER_PORT) { 110 vf610_gpio_writel(BIT(pin), port->base + PORT_ISFR); 111 112 generic_handle_domain_irq(port->chip.gc.irq.domain, pin); 113 } 114 115 chained_irq_exit(chip, desc); 116 } 117 118 static void vf610_gpio_irq_ack(struct irq_data *d) 119 { 120 struct vf610_gpio_port *port = 121 gpiochip_get_data(irq_data_get_irq_chip_data(d)); 122 int gpio = d->hwirq; 123 124 vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR); 125 } 126 127 static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type) 128 { 129 struct vf610_gpio_port *port = 130 gpiochip_get_data(irq_data_get_irq_chip_data(d)); 131 u8 irqc; 132 133 switch (type) { 134 case IRQ_TYPE_EDGE_RISING: 135 irqc = PORT_INT_RISING_EDGE; 136 break; 137 case IRQ_TYPE_EDGE_FALLING: 138 irqc = PORT_INT_FALLING_EDGE; 139 break; 140 case IRQ_TYPE_EDGE_BOTH: 141 irqc = PORT_INT_EITHER_EDGE; 142 break; 143 case IRQ_TYPE_LEVEL_LOW: 144 irqc = PORT_INT_LOGIC_ZERO; 145 break; 146 case IRQ_TYPE_LEVEL_HIGH: 147 irqc = PORT_INT_LOGIC_ONE; 148 break; 149 default: 150 return -EINVAL; 151 } 152 153 port->irqc[d->hwirq] = irqc; 154 155 if (type & IRQ_TYPE_LEVEL_MASK) 156 irq_set_handler_locked(d, handle_level_irq); 157 else 158 irq_set_handler_locked(d, handle_edge_irq); 159 160 return 0; 161 } 162 163 static void vf610_gpio_irq_mask(struct irq_data *d) 164 { 165 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 166 struct vf610_gpio_port *port = gpiochip_get_data(gc); 167 irq_hw_number_t gpio_num = irqd_to_hwirq(d); 168 void __iomem *pcr_base = port->base + PORT_PCR(gpio_num); 169 170 vf610_gpio_writel(0, pcr_base); 171 gpiochip_disable_irq(gc, gpio_num); 172 } 173 174 static void vf610_gpio_irq_unmask(struct irq_data *d) 175 { 176 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 177 struct vf610_gpio_port *port = gpiochip_get_data(gc); 178 irq_hw_number_t gpio_num = irqd_to_hwirq(d); 179 void __iomem *pcr_base = port->base + PORT_PCR(gpio_num); 180 181 gpiochip_enable_irq(gc, gpio_num); 182 vf610_gpio_writel(port->irqc[gpio_num] << PORT_PCR_IRQC_OFFSET, 183 pcr_base); 184 } 185 186 static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable) 187 { 188 struct vf610_gpio_port *port = 189 gpiochip_get_data(irq_data_get_irq_chip_data(d)); 190 191 if (enable) 192 enable_irq_wake(port->irq); 193 else 194 disable_irq_wake(port->irq); 195 196 return 0; 197 } 198 199 static const struct irq_chip vf610_irqchip = { 200 .name = "gpio-vf610", 201 .irq_ack = vf610_gpio_irq_ack, 202 .irq_mask = vf610_gpio_irq_mask, 203 .irq_unmask = vf610_gpio_irq_unmask, 204 .irq_set_type = vf610_gpio_irq_set_type, 205 .irq_set_wake = vf610_gpio_irq_set_wake, 206 .flags = IRQCHIP_IMMUTABLE | IRQCHIP_MASK_ON_SUSPEND 207 | IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND, 208 GPIOCHIP_IRQ_RESOURCE_HELPERS, 209 }; 210 211 static void vf610_gpio_disable_clk(void *data) 212 { 213 clk_disable_unprepare(data); 214 } 215 216 static int vf610_gpio_probe(struct platform_device *pdev) 217 { 218 struct gpio_generic_chip_config config; 219 struct device *dev = &pdev->dev; 220 struct vf610_gpio_port *port; 221 struct gpio_chip *gc; 222 struct gpio_irq_chip *girq; 223 unsigned long flags; 224 int i; 225 int ret; 226 bool dual_base; 227 228 port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL); 229 if (!port) 230 return -ENOMEM; 231 232 port->sdata = device_get_match_data(dev); 233 234 dual_base = port->sdata->have_dual_base; 235 236 /* 237 * Handle legacy compatible combinations which used two reg values 238 * for the i.MX8ULP and i.MX93. 239 */ 240 if (device_is_compatible(dev, "fsl,imx7ulp-gpio") && 241 (device_is_compatible(dev, "fsl,imx93-gpio") || 242 (device_is_compatible(dev, "fsl,imx8ulp-gpio")))) 243 dual_base = true; 244 245 if (dual_base) { 246 port->base = devm_platform_ioremap_resource(pdev, 0); 247 if (IS_ERR(port->base)) 248 return PTR_ERR(port->base); 249 250 port->gpio_base = devm_platform_ioremap_resource(pdev, 1); 251 if (IS_ERR(port->gpio_base)) 252 return PTR_ERR(port->gpio_base); 253 } else { 254 port->base = devm_platform_ioremap_resource(pdev, 0); 255 if (IS_ERR(port->base)) 256 return PTR_ERR(port->base); 257 258 port->gpio_base = port->base + IMX8ULP_GPIO_BASE_OFF; 259 port->base = port->base + IMX8ULP_BASE_OFF; 260 } 261 262 port->irq = platform_get_irq(pdev, 0); 263 if (port->irq < 0) 264 return port->irq; 265 266 port->clk_port = devm_clk_get(dev, "port"); 267 ret = PTR_ERR_OR_ZERO(port->clk_port); 268 if (!ret) { 269 ret = clk_prepare_enable(port->clk_port); 270 if (ret) 271 return ret; 272 ret = devm_add_action_or_reset(dev, vf610_gpio_disable_clk, 273 port->clk_port); 274 if (ret) 275 return ret; 276 } else if (ret == -EPROBE_DEFER) { 277 /* 278 * Percolate deferrals, for anything else, 279 * just live without the clocking. 280 */ 281 return ret; 282 } 283 284 port->clk_gpio = devm_clk_get(dev, "gpio"); 285 ret = PTR_ERR_OR_ZERO(port->clk_gpio); 286 if (!ret) { 287 ret = clk_prepare_enable(port->clk_gpio); 288 if (ret) 289 return ret; 290 ret = devm_add_action_or_reset(dev, vf610_gpio_disable_clk, 291 port->clk_gpio); 292 if (ret) 293 return ret; 294 } else if (ret == -EPROBE_DEFER) { 295 return ret; 296 } 297 298 gc = &port->chip.gc; 299 flags = GPIO_GENERIC_PINCTRL_BACKEND; 300 /* 301 * We only read the output register for current value on output 302 * lines if the direction register is available so we can switch 303 * direction. 304 */ 305 if (port->sdata->have_paddr) 306 flags |= GPIO_GENERIC_READ_OUTPUT_REG_SET; 307 308 config = (struct gpio_generic_chip_config) { 309 .dev = dev, 310 .sz = 4, 311 .dat = port->gpio_base + GPIO_PDIR, 312 .set = port->gpio_base + GPIO_PDOR, 313 .dirout = port->sdata->have_paddr ? 314 port->gpio_base + GPIO_PDDR : NULL, 315 .flags = flags, 316 }; 317 318 ret = gpio_generic_chip_init(&port->chip, &config); 319 if (ret) 320 return dev_err_probe(dev, ret, "unable to init generic GPIO\n"); 321 gc->label = dev_name(dev); 322 gc->base = -1; 323 324 /* Mask all GPIO interrupts */ 325 for (i = 0; i < gc->ngpio; i++) 326 vf610_gpio_writel(0, port->base + PORT_PCR(i)); 327 328 /* Clear the interrupt status register for all GPIO's */ 329 vf610_gpio_writel(~0, port->base + PORT_ISFR); 330 331 girq = &gc->irq; 332 gpio_irq_chip_set_chip(girq, &vf610_irqchip); 333 girq->parent_handler = vf610_gpio_irq_handler; 334 girq->num_parents = 1; 335 girq->parents = devm_kcalloc(&pdev->dev, 1, 336 sizeof(*girq->parents), 337 GFP_KERNEL); 338 if (!girq->parents) 339 return -ENOMEM; 340 girq->parents[0] = port->irq; 341 girq->default_type = IRQ_TYPE_NONE; 342 girq->handler = handle_edge_irq; 343 344 return devm_gpiochip_add_data(dev, gc, port); 345 } 346 347 static struct platform_driver vf610_gpio_driver = { 348 .driver = { 349 .name = "gpio-vf610", 350 .of_match_table = vf610_gpio_dt_ids, 351 }, 352 .probe = vf610_gpio_probe, 353 }; 354 355 module_platform_driver(vf610_gpio_driver); 356 MODULE_DESCRIPTION("VF610 GPIO driver"); 357 MODULE_LICENSE("GPL"); 358